这个习俗源于100年前的民间传说。

This custom ___descends from a folk tale 100 years ago.

这个习俗源自几个世纪前的传统。

This custom ___descends from a centuries-old tradition.

电梯缓缓下降到大楼的一层。

The elevator ___descends slowly to the ground floor of the building.

这条小路缓缓向下延伸到湖边。

The trail gently ___descends to the lakeside.

她出身于一个医生世家。

She ___descends from a family of doctors.